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Finding the Fourth Proportional to 2,780.48, 4,170 and 832.88

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Solution

The fourth proportional to 2,780.48, 4,170 and 832.88 is: 1,249.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,780.48 : 4,170 = 832.88 : x
  2. Step 2: Convert to fraction form
    2,780.48/4,170 = 832.88/x
  3. Step 3: Cross multiply
    2,780.48x = 4,170 × 832.88
  4. Step 4: Simplify right side
    2,780.48x = 3,473,109.60
  5. Step 5: Solve for x
    x = 3,473,109.60/2,780.48
  6. Step 6: Final answer
    x = 1,249.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.